Bensalem , Pennsylvania -LRB- CNN -RRB- -- About 100 vehicles were involved in a series of wrecks on the eastbound Pennsylvania Turnpike just north of Philadelphia on Friday morning , injuring at least 30 people and causing a traffic backup for hours over parts of two counties , officials said .

Glare from the rising sun and ice -- left over from a storm that dropped snow and freezing rain in the Philadelphia area -- might have been factors , state police Trooper Adam Reed said .

The wrecks started around 8:25 a.m. ET with a 14 - or 15-vehicle collision in southern Bucks County , not far from New Jersey state line , said Bill Capone , spokesman for the Pennsylvania Turnpike Commission .

About 20 more sets of wrecks stretching for miles occurred on the turnpike , said Pat Ponticelli , Bensalem Township 's deputy director of public safety .

Each apparently happeed as traffic slowed for crashes ahead .

In a number of areas , smashed vehicles were piled into each other with their front ends pointing in different directions , aerial video from CNN affiliate WPVI showed .

In one spot , at least nine vehicles appeared to be crunched in a jumbled group behind a tractor-trailer . In another , a couple of vehicles had come to rest against a jackknifed truck .

Thirty people were hurt , including five with serious , but non-life-threatening injuries , Reed said .

More than half of those injured were taken to Abington Memorial Hospital , where they were diagnosed with minor to moderate injuries , Dr. John J. Kelly , the chief of staff , said .

`` I think we really saw mostly what we would call soft-tissue injuries , bumps and scrapes type of injuries , '' he said .

Traffic was moving again in one affected section of the turnpike by 2 p.m. , video from CNN affiliate KYW showed .

Pennsylvania State Police said it hoped to have the road fully open by 5 p.m.

Heather Pasco , a driver involved in one of the crashes , told KYW that she thought she was a goner .

Pasco said she had stopped her car after she saw `` cars bouncing off of the center divider . '' Although she stopped , a truck behind her did n't , she said .

`` I looked in my rearview mirror , and there was a big ... truck right behind me , and he was trying to stop , but he was sliding and he slammed right into the back of me , which then made me slam into the car in front of me , '' she told KYW .

`` I saw him -LRB- in the mirror -RRB- , and I thought I was done , '' Pasco added . `` The entire back end of my car is gone . ''

Police told her that her wreck was about 3.5 miles behind the initial crash , she said . She said the road , after snow and freezing rain had fallen in the area , was n't `` really plowed very well . ''

Traffic was backed up for miles , stretching west into adjacent Montgomery County .

CNN 's John Newsome , Lena Jakobsson and John Fricke contributed to this report .

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NEW : A number of the victims suffered soft-tissue injuries , a doctor says

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Crash victim says truck sandwiched her car into another vehicle ; ' I thought I was done '

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At least 30 people are taken to hospitals , turnpike commission says

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About 100 vehicles crash on Pennsylvania Turnpike north of Philadelphia , official says